Adaptec 2025ZCR Installation Manual

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Adaptec 2025ZCR Installation Manual Manual pdf 27 page image

2-4Adaptec RAID Installation GuideSCSI TerminationThe basics of termination are as follows: Enable termination on the devices on each physical end of aSCSI cable. Depending upon how you configure your system,you would either Enable termination on two SCSI peripheral devices, or Enable termination on the SCSI controller and oneperipheral SCSI device. If you are using multiple SCSI channels on a single controller,terminate each channel separately.SCSI termination for Adaptec SCSI RAID controllers is configuredthrough the SMOR utility or from the Configure Host Bus Adapterwindow in Storage Manager. The controller has four possibletermination settings, as shown in the following table:Devices on the second bus (Bus 1) and higher (if the RAID controllerhas more than two) must have Wide termination.By using a 68-pin to 50-pin SCSI cable adapter, a Narrow device canbe attached to a Wide cable along with Wide devices. However, thedevice at the end of the cable must be a Wide device so that all SCSIsignals are terminated. For internal and external cables where onecable is Narrow, set the controller termination to High Only.Setting FunctionAuto Default—Used for all cabling conditions, except wheretwo Narrow cables are attached or both Narrow and Widecables are attached. For these exceptions, use High Only. 11 This termination option is not available on the 2000S or 2005S. These ZCR controllershave only On (enabled) and Off (disabled) available, with On being the default.High Only Terminates only the additional signals that are used onWide SCSI devices. This allows attachment of a Narrowcable, or both a Wide and Narrow cable together, to beattached to the controller. 1Disabled Disables controller termination unconditionally.Enabled Enables controller termination unconditionally.